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The CS655 is a multiparameter, smart soil sensor designed using advanced measurement techniques to accurately monitor volumetric water content, bulk electrical conductivity (EC), and soil temperature. Featuring an SDI-12 output, it integrates seamlessly with a wide range of data loggers. With shorter rods than the CS650, it is particularly well-suited for challenging or high-density soil conditions.
- Larger sample volume for reduced measurement error
- Automatic correction for soil texture and electrical conductivity effects
- Provides reliable soil-water content estimates across a broad range of mineral soils
- Versatile, three-parameter sensor measuring dielectric permittivity, EC, and temperature
The CS655 includes two 12-cm stainless-steel rods connected to a fully encapsulated epoxy-sealed circuit board, ensuring long-term durability in harsh soil environments. A shielded cable attaches the sensor to compatible data loggers.
The sensor measures:
Propagation time
Signal attenuation
Temperature
From these raw measurements, it derives:
Dielectric permittivity
Volumetric water content
Bulk electrical conductivity
Its attenuation-based correction compensates for loss effects during reflection detection, enabling accurate water-content measurements in soils with EC ≤ 8 dS/m—without requiring soil-specific calibration.
A precision thermistor located near the probe rods provides dependable temperature readings. When installed horizontally, the CS655 delivers soil-temperature measurements at the same depth as water-content measurements, ensuring depth-consistent data. When installed vertically or at an angle, temperature readings correspond to the region near the rods’ entry point into the epoxy body.
